Experimental Research on Mechanical Properties of Timber in Ancient Tibetan Building

Experimental Research on Mechanical Properties of Timber in Ancient Tibetan Building
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西藏古建筑木材力学性能试验研究

DOI:
10.1061/(asce)mt.1943-5533.0000438
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发表时间:
2012-06
期刊:
J. Mater. Civ. Eng.
影响因子:
--
通讯作者:
Yang, Q
Yang, Q
中科院分区:
其他
文献类型:
--
作者:
Yang, N(杨娜), Li, P., Law, S.,;Yang, Q

文献摘要

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木材的力学性能是古木结构鉴定的前提。通过对老青杨、新青杨、新松3种木材的主要力学性能的试验研究,得出了3种木材的主要力学性能。讨论了确定这些强度的原则和假设,以及西藏古代建筑木材设计强度的时间变化规律。研究发现,经过几百年的发展,西藏青杨的物理力学性质已经发生了很大的退化。当应力比较低时,构件的强度退化主要是由于木材的腐朽和开裂,而当应力比较高时,构件的强度退化主要是由于荷载历时效应引起的木材蠕变。新的西藏松也被检查是一个很好的材料,用于修复西藏古建筑,由于其较高的强度相比,旧的宝。
AbstractThe mechanical property of timber is a prerequisite for the evaluation of ancient timber structures. The main mechanical properties of three kinds of timber including the old Tibetan Populus cathayana, new Tibetan Populus cathayana and new Tibetan Pine were obtained by tests in this paper. The principles and assumptions made in the determination of these strengths and the time-dependent laws on the design strength of timber in ancient Tibetan structures were discussed. It is found that the physical and mechanical properties of Tibetan Populus cathayana have degraded greatly after hundreds of years. The strength degradation of a structural component can be attributed to the decay and cracking of timber when the stress ratio is low while it can be attributed to the creep of timber caused by the load duration effect when the stress ratio is high. The new Tibetan Pine is also checked to be a good material for the restoration of ancient Tibetan building due to its higher strength compared to the old Po...
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